Three-way coupling



FIG. 1 is an isometric view of a three-way coupling showing my new design;

FIG. 2 is a top plan view thereof with the bottom being identical;

FIG. 3 is a front elevantional view thereof;

FIG. 4 is a right side elevational view with the left side being a mirror image thereof; and,

FIG. 5 is a rear elevational view. 

The ornamental design for a three-way coupling, as shown and described. 